Necticut



(No Model.)

0. H. COOLEY & F. H. RICHARDS. SGALE BEAM FOR GRAIN WEIGHEHS.

No. 440,740. Patented Nov. 18, 1890.

lu P UNITED STATES PATENT OFFICE.

CHARLES H. COOLEY AND FRANCIS l-I. RICHARDS, OF HARTFORD, CON- NECTICUT, ASSIGNORS TO THE PRATT & WHITNEY COMPANY, OF SAME PLACE.

SCALE-BEAM FOR GRAIN-WEIGHERS.

SPECIFICATION forming part of Letters Patent No. 440,740, dated November 18, 1890. Application filed November 15, 1889. Serial No. 330,405. (No model.)

T at whom it may concern.-

Be it known that we, CHARLES H. COOLEY and FRANCIS H. RICHARDS, citizens of the United States, residing at Hartford, in the county of Hartford and State of Connecticut,

have invented certain new and useful Improvements in Scale-Beams for Grain-Weighers, of which the following is a specification.

This invention relates to scale-beams espe- IO cially adapted for use in automatic grainweighers, the object being to furnish such a scale-beam adapted to be made of cast-iron and to have the necessary form, lightness, and stiffness, together with other features hereinafter more fully set forth.

. In the drawings accompanyingand forming a part of this specification, Figure 1 is an end elevation of a scale-beam embodying our present improvements. Fig. 2 isa plan view of the same. Fig. 3 is an inlarged inverted plan view of one end of the beam. Fig. 4: is a vertical sectional elevation on the line a a, Fig. 3.

Similar characters designate like parts in z 5 all the figures.

The mode of using our improved scalebeam is shown in prior Letters Patent or applications of each of the present applicants-- as, for instance, in the Letters Patent, No.

416,714, granted to C. H. Cooley, December 10, 1889, and in the application of F. H. Richards, Serial No. 308,627 filed April 25, 1889.

In this application, in Figs. 1 and i the letter P designates some portion of the frame- 5 work of a grain-Weigher of a class such as illustrated in said prior applications, said portion being usually the top plate of the frame-Work, which plate carries the supplychute and the beam-supporting knife-edges.

The scale-beam consists of a central shaft B, usually formed hollow, as shown, the ends being closed by the cap 35, two bucket-supporting arms 2 and 4, provided at their outer ends with the knife-edges 3 and 5, held in place by screw 3, a weight-supporting arm oppositely disposed on said shaft relatively to said arms 2 and 4, suitable knife-edges on Which to suspend the grain-bucket and the 1nain-weight,and bearings which are adapted to rest on said beam-supporting knife-edges that are carried by said frame-work P.

The several arms 2 and at and the doubleweight arm D are joined integrally to the sides of the said shaft B, and in depth at the point of juncture are substantially coincident with said shaft. The arm D comprises in the best form thereof two arms 10 and 12, which are united or merged into one at the outer end for carrying the weight-supporting knife-edge 14, and which are joined to the shaft B at points 11 and 13, which are at a considerable distance apart on said shaft. The two walls 10 and 12 of the armD hav ing an increasing ratio of divergence, as shown in Fig. 2, from the outer toward the inner end thereof, the highest efficiency of said walls and of the shaft, considering these as one unitary or integral structure, is attained. This result is one peculiarly desirable in the beam of a grain-weigher Where extreme rigidity, combined with lightness, is unusually important.

The beam-bearings 16 and 20 are fixed to the under side of the beam-shaft and are secured in place by screws. In Figs. 3 and 4: the screw 21 is shown holding the v bearing 20 in place between the guides 2325 on said shaft, while the head 22 of the screw serves as a stop to bear against the side of the knifeedge 30, whose stem 32 fits in a hole, in said frame-work 'P. Said stem 32, being round and not too closely fitted in said hole, permits the knife-edge 30 to revolve in said hole to perfectly accommodate the bearing 20 as the beam osci lates, and in case the axis of the beam and the seat for the knife-edge in said bearing do not perfectly coincide. The knifeedge 30 is in its best form made cylindrical or rounded on the outer diameter thereof, so that it bears with a rounded surface against the rounded surface of said head 22. This furnishes an end-motion-stop, consisting of two opposing rounded surfaces, and which our experience shows is the most desirable and effective form of such stop for use in connection with grain-weigher scale-beams.

Having thus described our invention, we claim- 1. In a scale-beam, the combination, with the tubular shaft B, of the bucket-supporting arms and the Weight-arm, each furnished with a knife-edge on the upper side and at the outer end thereof, and V-blocks on the under side and at the ends of said shaft, said arms being lowered at the ends to bring the knife-edges to the proper height relative to the bearings of said V-blocks.

2. The combination, with a scale-beam having a seat for the V-block, of the V-bioek in said seat, the knife-edge bearing in said block, and the screw holding said block in place and having the rounded side of its head forming a stop for bearing against the side of said knife-edge, whereby said screw performs the double function of a holding-screw and a stop-screw.

3. The combination, with the scale-beam shaft constructed to receive the block 20, of the block 20, the knife-edge 30, bearing in the V of said block 20, and the block-holding screw 21, having the head 22, forming a rounded stop for bearing against the side of said knife-edge at the point thereof.

CHARLES H. (JOOLEY. FRANCIS H. RICHARDS. Witnesses:

LEWIS O. HEERMANN, WM. P. LARAWAY, 

